Fractional-N frequency synthesizer with jitter compensation

A fractional-N frequency synthesizer has a VCO with an output for supplying an output signal of a particular frequency, and an input for receipt of a control signal for controlling the operation of the VCO so that it lock in on a reference frequency. Compensation circuitry is coupled to the input fo...

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Bibliographische Detailangaben
Hauptverfasser:	GAETHKE, RAINER, LINEBARGER, DANIEL J
Format:	Patent
Sprache:	eng
Schlagworte:	AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY ELECTRICITY
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A fractional-N frequency synthesizer has a VCO with an output for supplying an output signal of a particular frequency, and an input for receipt of a control signal for controlling the operation of the VCO so that it lock in on a reference frequency. Compensation circuitry is coupled to the input for compensating the output signal for phase jitter. The compensation circuitry has a charge pump that supplies a compensation current to the input. The timing is derived from the output signal, thus rendering the compensation current independent of the frequency range of the VCO and of the reference frequency.